US4829015A - Method for manufacturing a fully self-adjusted bipolar transistor - Google Patents
Method for manufacturing a fully self-adjusted bipolar transistor Download PDFInfo
- Publication number
- US4829015A US4829015A US07/170,897 US17089788A US4829015A US 4829015 A US4829015 A US 4829015A US 17089788 A US17089788 A US 17089788A US 4829015 A US4829015 A US 4829015A
- Authority
- US
- United States
- Prior art keywords
- etching
- layer
- silicon
- emitter
- mask
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 17
- 239000010703 silicon Substances 0.000 claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 12
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims abstract description 11
- 238000005530 etching Methods 0.000 claims description 49
- 229920002120 photoresistant polymer Polymers 0.000 claims description 14
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 12
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 12
- 229920005591 polysilicon Polymers 0.000 claims description 10
- 238000000151 deposition Methods 0.000 claims description 5
- 150000002500 ions Chemical class 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000003071 parasitic effect Effects 0.000 abstract description 7
- 238000009413 insulation Methods 0.000 abstract description 5
- 230000008021 deposition Effects 0.000 description 4
- 238000005468 ion implantation Methods 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8222—Bipolar technology
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/70—Bipolar devices
- H01L29/72—Transistor-type devices, i.e. able to continuously respond to applied control signals
- H01L29/73—Bipolar junction transistors
- H01L29/732—Vertical transistors
- H01L29/7325—Vertical transistors having an emitter-base junction leaving at a main surface and a base-collector junction leaving at a peripheral surface of the body, e.g. mesa planar transistor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S148/00—Metal treatment
- Y10S148/01—Bipolar transistors-ion implantation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S148/00—Metal treatment
- Y10S148/011—Bipolar transistors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S148/00—Metal treatment
- Y10S148/017—Clean surfaces
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Bipolar Transistors (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3717153 | 1987-05-21 | ||
DE3717153 | 1987-05-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
US4829015A true US4829015A (en) | 1989-05-09 |
Family
ID=6328093
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/170,897 Expired - Fee Related US4829015A (en) | 1987-05-21 | 1988-03-21 | Method for manufacturing a fully self-adjusted bipolar transistor |
Country Status (5)
Country | Link |
---|---|
US (1) | US4829015A (de) |
EP (1) | EP0293641B1 (de) |
JP (1) | JPS63305560A (de) |
AT (1) | ATE59499T1 (de) |
DE (1) | DE3861424D1 (de) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4954865A (en) * | 1988-05-10 | 1990-09-04 | Stc Plc | Integrated circuits |
US4983531A (en) * | 1990-02-12 | 1991-01-08 | Motorola, Inc. | Method of fabricating a single polysilicon bipolar transistor which is compatible with a method of fabricating CMOS transistors |
US5109263A (en) * | 1989-07-28 | 1992-04-28 | Hitachi, Ltd. | Semiconductor device with optimal distance between emitter and trench isolation |
US5116770A (en) * | 1988-07-14 | 1992-05-26 | Matsushita Electric Industrial Co., Ltd. | Method for fabricating bipolar semiconductor devices |
US5162244A (en) * | 1988-09-23 | 1992-11-10 | Samsung Electronics Co., Ltd. | Bipolar transistor and manufacturing method thereof |
US5188971A (en) * | 1988-12-28 | 1993-02-23 | Synergy Semiconductor Corporation | Process for making a self-aligned bipolar sinker structure |
US5236851A (en) * | 1988-07-14 | 1993-08-17 | Matsushita Electric Industrial Co., Ltd. | Method for fabricating semiconductor devices |
US5696007A (en) * | 1995-12-20 | 1997-12-09 | Electronics And Telecommunications Research Institute | Method for manufacturing a super self-aligned bipolar transistor |
US5814547A (en) * | 1997-10-06 | 1998-09-29 | Industrial Technology Research Institute | Forming different depth trenches simultaneously by microloading effect |
US5943578A (en) * | 1993-02-05 | 1999-08-24 | Kabushiki Kaisha Toshiba | Method of manufacturing a semiconductor device having an element isolating region |
US6114743A (en) * | 1996-12-10 | 2000-09-05 | Sgs-Thomson Microelectronics S.A. | Well isolation bipolar transistor |
US6156594A (en) * | 1996-11-19 | 2000-12-05 | Sgs-Thomson Microelectronics S.A. | Fabrication of bipolar/CMOS integrated circuits and of a capacitor |
US6180442B1 (en) | 1996-11-19 | 2001-01-30 | Sgs-Thomson Microelectronics S.A. | Bipolar transistor with an inhomogeneous emitter in a BICMOS integrated circuit method |
US6348393B1 (en) * | 1998-08-26 | 2002-02-19 | Agere Systems Guardian Corp. | Capacitor in an integrated circuit and a method of manufacturing an integrated circuit |
US6444536B2 (en) * | 1999-07-08 | 2002-09-03 | Agere Systems Guardian Corp. | Method for fabricating bipolar transistors |
RU2492551C1 (ru) * | 2012-04-05 | 2013-09-10 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Национальный исследовательский университет "МИЭТ" | Самосовмещенный высоковольтный интегральный транзистор |
RU2492546C1 (ru) * | 2012-04-05 | 2013-09-10 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Национальный исследовательский университет "МИЭТ" | Способ изготовления самосовмещенного высоковольтного интегрального транзистора |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8900319A (nl) * | 1989-02-09 | 1990-09-03 | Imec Inter Uni Micro Electr | Bipolaire transistor en werkwijze voor het vervaardigen daarvan. |
US5017990A (en) * | 1989-12-01 | 1991-05-21 | International Business Machines Corporation | Raised base bipolar transistor structure and its method of fabrication |
KR920007211A (ko) * | 1990-09-06 | 1992-04-28 | 김광호 | 고속 바이폴라 트랜지스터 및 그의 제조방법 |
DE19632412A1 (de) * | 1996-08-05 | 1998-02-12 | Sifu Hu | Vertikaler Bipolartransistor und Verfahren zu seiner Herstellung |
DE10128481B4 (de) * | 2001-06-12 | 2004-01-08 | Infineon Technologies Ag | Verfahren zur Ätzung eines Substrats |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0029900A2 (de) * | 1979-11-29 | 1981-06-10 | International Business Machines Corporation | Als bipolarer Transistor in einem Halbleitersubstrat ausgebildetes selbstjustiertes Schaltungs- oder Bauelement und Verfahren zur Herstellung |
EP0039411A2 (de) * | 1980-05-05 | 1981-11-11 | International Business Machines Corporation | Herstellungsverfahren einer integrierten PNP- und NPN-Transistorstruktur |
EP0062170A2 (de) * | 1981-04-07 | 1982-10-13 | International Business Machines Corporation | Verfahren zur Herstellung selbstalignierter dielektrischer Isolation |
US4378630A (en) * | 1980-05-05 | 1983-04-05 | International Business Machines Corporation | Process for fabricating a high performance PNP and NPN structure |
US4392149A (en) * | 1980-03-03 | 1983-07-05 | International Business Machines Corporation | Bipolar transistor |
EP0094482A2 (de) * | 1982-05-18 | 1983-11-23 | International Business Machines Corporation | Verfahren zur Herstellung eines Transistors mit flachem Emitter und schmalem intrinsischem Basisgebiet |
EP0036499B1 (de) * | 1980-03-24 | 1984-08-15 | International Business Machines Corporation | Ein selbstjustierendes Verfahren für einen Bipolartransistor auf Polysilicium-Basis |
UST104803I4 (en) * | 1981-07-13 | 1984-11-06 | Self-aligned process for providing an improved high performance bipolar transistor | |
EP0166923A2 (de) * | 1984-06-29 | 1986-01-08 | International Business Machines Corporation | Hochleistungsbipolartransistor mit einem zwischen dem Emitter und der Extrinsic-Basiszone angeordneten leicht dotierten Schutzring |
US4745087A (en) * | 1987-01-13 | 1988-05-17 | Advanced Micro Devices, Inc. | Method of making fully self-aligned bipolar transistor involving a polysilicon collector contact formed in a slot with an oxide sidewall |
-
1988
- 1988-03-21 US US07/170,897 patent/US4829015A/en not_active Expired - Fee Related
- 1988-05-09 DE DE8888107441T patent/DE3861424D1/de not_active Expired - Fee Related
- 1988-05-09 AT AT88107441T patent/ATE59499T1/de active
- 1988-05-09 EP EP88107441A patent/EP0293641B1/de not_active Expired - Lifetime
- 1988-05-17 JP JP63118416A patent/JPS63305560A/ja active Pending
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0029900A2 (de) * | 1979-11-29 | 1981-06-10 | International Business Machines Corporation | Als bipolarer Transistor in einem Halbleitersubstrat ausgebildetes selbstjustiertes Schaltungs- oder Bauelement und Verfahren zur Herstellung |
US4392149A (en) * | 1980-03-03 | 1983-07-05 | International Business Machines Corporation | Bipolar transistor |
EP0036499B1 (de) * | 1980-03-24 | 1984-08-15 | International Business Machines Corporation | Ein selbstjustierendes Verfahren für einen Bipolartransistor auf Polysilicium-Basis |
EP0039411A2 (de) * | 1980-05-05 | 1981-11-11 | International Business Machines Corporation | Herstellungsverfahren einer integrierten PNP- und NPN-Transistorstruktur |
US4378630A (en) * | 1980-05-05 | 1983-04-05 | International Business Machines Corporation | Process for fabricating a high performance PNP and NPN structure |
EP0062170A2 (de) * | 1981-04-07 | 1982-10-13 | International Business Machines Corporation | Verfahren zur Herstellung selbstalignierter dielektrischer Isolation |
UST104803I4 (en) * | 1981-07-13 | 1984-11-06 | Self-aligned process for providing an improved high performance bipolar transistor | |
EP0094482A2 (de) * | 1982-05-18 | 1983-11-23 | International Business Machines Corporation | Verfahren zur Herstellung eines Transistors mit flachem Emitter und schmalem intrinsischem Basisgebiet |
EP0166923A2 (de) * | 1984-06-29 | 1986-01-08 | International Business Machines Corporation | Hochleistungsbipolartransistor mit einem zwischen dem Emitter und der Extrinsic-Basiszone angeordneten leicht dotierten Schutzring |
US4745087A (en) * | 1987-01-13 | 1988-05-17 | Advanced Micro Devices, Inc. | Method of making fully self-aligned bipolar transistor involving a polysilicon collector contact formed in a slot with an oxide sidewall |
Non-Patent Citations (6)
Title |
---|
IEDM Techn. Dig. 1980, pp. 58 60, A Symmetrical Bipolar Structure , by D. D. Tang et al. * |
IEDM Techn. Dig. 1980, pp. 58-60, "A Symmetrical Bipolar Structure", by D. D. Tang et al. |
IEEE Transactions on Electron Devices, vol. ED 29, No. 4, Apr., 1982, Self Aligned Transistor with Sidewall Base Electrode , by Tohru Nakamura et al., pp. 596 600. * |
IEEE Transactions on Electron Devices, vol. ED-29, No. 4, Apr., 1982, "Self-Aligned Transistor with Sidewall Base Electrode", by Tohru Nakamura et al., pp. 596-600. |
Siemens Forsch u. Entwickl. Ber., vol. 13 (1984), No. 5, Self Aligned Bipolar Technology New Chances for Very High Speed Digital Integrated Circuits , by A. W. Wieder, pp. 246 252. * |
Siemens Forsch-u. Entwickl.-Ber., vol. 13 (1984), No. 5, "Self-Aligned Bipolar Technology-New Chances for Very-High-Speed Digital Integrated Circuits", by A. W. Wieder, pp. 246-252. |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4954865A (en) * | 1988-05-10 | 1990-09-04 | Stc Plc | Integrated circuits |
US5116770A (en) * | 1988-07-14 | 1992-05-26 | Matsushita Electric Industrial Co., Ltd. | Method for fabricating bipolar semiconductor devices |
US5236851A (en) * | 1988-07-14 | 1993-08-17 | Matsushita Electric Industrial Co., Ltd. | Method for fabricating semiconductor devices |
US5162244A (en) * | 1988-09-23 | 1992-11-10 | Samsung Electronics Co., Ltd. | Bipolar transistor and manufacturing method thereof |
US5188971A (en) * | 1988-12-28 | 1993-02-23 | Synergy Semiconductor Corporation | Process for making a self-aligned bipolar sinker structure |
US5109263A (en) * | 1989-07-28 | 1992-04-28 | Hitachi, Ltd. | Semiconductor device with optimal distance between emitter and trench isolation |
US4983531A (en) * | 1990-02-12 | 1991-01-08 | Motorola, Inc. | Method of fabricating a single polysilicon bipolar transistor which is compatible with a method of fabricating CMOS transistors |
US5943578A (en) * | 1993-02-05 | 1999-08-24 | Kabushiki Kaisha Toshiba | Method of manufacturing a semiconductor device having an element isolating region |
US5696007A (en) * | 1995-12-20 | 1997-12-09 | Electronics And Telecommunications Research Institute | Method for manufacturing a super self-aligned bipolar transistor |
US6180442B1 (en) | 1996-11-19 | 2001-01-30 | Sgs-Thomson Microelectronics S.A. | Bipolar transistor with an inhomogeneous emitter in a BICMOS integrated circuit method |
US6156594A (en) * | 1996-11-19 | 2000-12-05 | Sgs-Thomson Microelectronics S.A. | Fabrication of bipolar/CMOS integrated circuits and of a capacitor |
US6114743A (en) * | 1996-12-10 | 2000-09-05 | Sgs-Thomson Microelectronics S.A. | Well isolation bipolar transistor |
US6184102B1 (en) * | 1996-12-10 | 2001-02-06 | Sgs-Thomson Microelectronics S.A. | Method for manufacturing a well isolation bipolar transistor |
US6432789B2 (en) | 1996-12-10 | 2002-08-13 | Sgs-Thomson Microelectronics S.A | Method of forming a well isolation bipolar transistor |
US5814547A (en) * | 1997-10-06 | 1998-09-29 | Industrial Technology Research Institute | Forming different depth trenches simultaneously by microloading effect |
US6348393B1 (en) * | 1998-08-26 | 2002-02-19 | Agere Systems Guardian Corp. | Capacitor in an integrated circuit and a method of manufacturing an integrated circuit |
US6444536B2 (en) * | 1999-07-08 | 2002-09-03 | Agere Systems Guardian Corp. | Method for fabricating bipolar transistors |
RU2492551C1 (ru) * | 2012-04-05 | 2013-09-10 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Национальный исследовательский университет "МИЭТ" | Самосовмещенный высоковольтный интегральный транзистор |
RU2492546C1 (ru) * | 2012-04-05 | 2013-09-10 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Национальный исследовательский университет "МИЭТ" | Способ изготовления самосовмещенного высоковольтного интегрального транзистора |
Also Published As
Publication number | Publication date |
---|---|
JPS63305560A (ja) | 1988-12-13 |
ATE59499T1 (de) | 1991-01-15 |
EP0293641A1 (de) | 1988-12-07 |
EP0293641B1 (de) | 1990-12-27 |
DE3861424D1 (de) | 1991-02-07 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: SIEMENS AKTIENGESELLSCHAFT, MUNICH, A GERMAN CORPO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:SCHABER, HANS-CHRISTIAN;MEUL, HANS-WILLI;REEL/FRAME:004878/0156 Effective date: 19880310 Owner name: SIEMENS AKTIENGESELLSCHAFT, A GERMAN CORPORATION, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHABER, HANS-CHRISTIAN;MEUL, HANS-WILLI;REEL/FRAME:004878/0156 Effective date: 19880310 |
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Year of fee payment: 4 |
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